<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
     <style>
        .active {
            border: 2px solid rgb(76, 76, 165);
        }
    </style>
</head>
<body>
     <script src="vue3.js"></script>
     <div id="app">
      <div>
        <h3 v-bind:title="title">图片切换边框</h3>
       <img  v-bind:src="img" width="100" height="100" v-bind:class="{active:isActive}">
      </div>
      <p v-bind:style="{color:textColor,fontSize:fontSize+'px'}">This is a paragraph.
        <button @click="toggleActive">切换</button>
    </div>
    <script>
         const app = Vue.createApp({
            data(){
                return{
                    title:"切换图片边框",
                    img:"./logo.png",
                    textColor:"red",
                    fontSize:16,
                    isActive:false,
                }
            },
            methods:{
                toggleActive(){
                     this.isActive = !this.isActive;
                }
            }
        }).mount("#app");
    </script>
  </body>
</html>